Hua-Shan Shi (NCU) ; Wing-Huen Ip (NCU)
Dwarf planets in Kuiper belt are too far for us to study in detail by telescopic observations from Earth for the past several decades. After the New Horizons spacecraft’s flyby observation of the Pluto-Charon system in July 2015, we finally have some understanding of these faraway objects. In this work, we use a coupled treatment of the Clausius-Clapeyron equation and the surface energy balance equation - under the condition of vapor pressure equilibrium - to compute the surface temperature and the production rates of N2, and CO gas of Pluto when it revolves around the sun in its eccentric orbits. A simple model is used to calculate the amount of nitrogen gas emitted from the Sputnik Planitia. In addition, we apply this model to other Pluto-like dwarf planets in the Kuiper belt which surface are probably partially composed of nitrogen ice. This set of model calculations allows us to explore the range of the atmospheric content and the corresponding escape dynamics in dwarf planets.